A salesman sells 2 kinds of trousers;cotton and woollen. a pair of cotton trousers is sold at 30 % profit an pair of woollen trousers at 50% profit. The salesman has calculated that if he sells 100% more woollen trousers his overall profit would be 45%.However he ends up selling 50% more cotton trousers than woollen trousers. What will be his overall profit?

1) 37.5%
2) 40%
3) 41%
4) 42.33%
5) none of these